I would like to know if it's possible to implement a SFTP server in an "old" VxWorks cRIO-9022 controller.
I am not really qualified about SSH and so on, so please excuse me if it is a stupid question
If you wanted to implement SFTP I would recommend using WebDAV:
Using WebDAV to Transfer Files
However if securing the file is not an issue you could try FTP instead:
This is how you would set up FTP:
Using FTP With an NI Linux Real-Time Target
Then have a look at transfer files over:
How Can I Transfer Files over FTP to a Remote System?
How Do I Transfer Files to a FTP Server?
Hope this helps.